ML20086D765

AO 73-10:on 730417,relief Valve Initiation Time Delay Relay Failed to Actuate.Similar Event Occurred on 721020.Relay Replaced & Replacement Verified

ML20086D765
Person / Time
Site:	Vermont Yankee
Issue date:	04/18/1973
From:	Riley B VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D757	List: ML20086D755 ML20086D765
References
AO-73-10, VYV-2624, NUDOCS 8312050095
Download: ML20086D765 (2)

Text

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e-I VF[IRMONT Y AhCEE NUCLEAR Powi@CORPOIC ATION

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W stvcury se ve u o n ovt v.v nt e.T IDJTL AND, Yl'E M O NT 05708 VYV-2624 "'*

r. 9. von esi VERHON. VERMOM 05304 -

April 18, 1973

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United States At onic Energy Comincian Directorat e of Regulatory Operatiubs, Region 1 V70 troart Street Newark, Nov .let5.cy 07102 ,t. .. . .. -. .,, ,

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RffERFEE : Operat ing 1.icense DPR-28 t :p ,_.,

Docket ?to . 5(>-2 71 C 'J. . 3 7 .6 -

3 Abnornel Occurrence No. A0 73-10 %h ! ;[ -

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As defined by Technical Specificatiuos f or the Vermnt Yanken 'p,[%:j Nuclear Power S t es t ion , Sect ion 6. 7. A.c , ve are repor t ing the following -

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Abnornisl occurrence as A&-7 3-10 and conf ir ming our telep5oac  ;-j-ff,$:

,.N.J 2g, convercat ion wit h your of fice.

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w' At approximat ely 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> un April 17. durinr. thn perf orvaance

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a of Lhe Autwat ic Depresouritat ton Syr.t en "B" ingic Te et , the Relief , , , '

Valve lof tiation Titc Dolny Relay (Ha. 2E-K5B) is11ed to actuate in . ;.' ,; . e .

<120 s.ce nnd s. an i ruuired by Table 3.2.1 of Technical Specificatinnr.. -

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Th r- reactor 5 se operating at approximately 75% powr at the time of this occurre cc.

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'lhe relay was replaced and the replacerrnt v.u verified to operate 7 .' ,l' in 51 20 suondo on required by Technient Rpecifications. The original g ..,:f .

relay previour.ly failed uurveillauce testing on 10/20/72 (Au-77-08). Thir. rU . , p*i c 7 '

incident 10 corrently under reviev, very truly yours.

VEILHONT YANKEE NUCLEAR POWER CORITRATION

. . t B.W. Riley N Plor t Superintendent BMB/kbd I

- 8312O50093 730420 PDR ADOCK 05000 S

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, Licensco: Vermont" Yankee Nuclear Power Corp.

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J J. C. Keppler, no (2) eArt Dochet No.: 50-271 '

i Abriornal Occurrence: 73-10 '

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DR Central Files (1) r. Aic The attached report from the subject licensee is Regulatory Standards 3)

Dir. cf Licensing (13 fort.'arded in accordance trith RO Mnnunt Chanter 1000 10 (' dame ee a wa.:) t .ig;s ts ht w r.as .

The action taken by the licensee is considered DATE appropriato. Follovup tiill be performed during the next insnection as annronrinte. Coni rt<: of p I ftOF,1 (fetmo and unst) ftL M ARK 5 f

the report have bcon forwarded to the PDR, Local 0 0/l -

A, PDR, NSIC, DTIE and Stato representativos. The D. L. Ca hton, RO:I licenscc will submit a 10 day written report to r.o.( M CATE f 4/19/73 Licensing;

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